These ThinOptics Readers + Black Keychain Case are so great -- wherever you go and whatever you read when you get there, having your keys and reading glasses with you is key -- pun intended. A marvel of modern engineering, this durable Keychain Case masterfully holds and protects your Readers until you need them. And when you do, clear vision is just a slide of the finger away! Conveniently keep your keys AND your Readers Always With You. Durable Readers live cocooned in the strong Black Keychain Case and magically emerge with the slide of a finger. Readers are available in all four of the most popular lens strength options (+1.0, +1.5, +2.0, & +2.5 diopters). Attach them to your keys or fasten to a backpack, golf bag or luggage for easy access anywhere.